实验1

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#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define N 100
#define CNT 5

int main(){
	int number;
	int i;
	
	srand(time(0));
	for(i = 0; i < N; ++i){
		number = rand() % 100 + 1;
		printf("20490042%04d\n",number);
	}
	
	return 0;
}

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【1】随机抽取学号
【2】在1到100之间选取一个随机数
【3】使number都以四位输出，确保学号位数一致
【4】使每一次运行的结果都不同

实验2

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#include <stdio.h>

int main() {
    int choice, quantity;
    float total_price = 0, amount_paid, change;

    while (1) {
        printf("\n自动饮料售卖机菜单:\n");
        printf("1. 可乐 - 3 元/瓶\n");
        printf("2. 雪碧 - 3 元/瓶\n");
        printf("3. 橙汁 - 5 元/瓶\n");
        printf("4. 矿泉水 - 2 元/瓶\n");
        printf("0. 退出购买流程\n");
        printf("请输入饮料编号: ");
        scanf("%d", &choice);

        if (choice == 0)
            break;

        if (choice < 1 || choice > 4) {
            printf("无效的饮料编号，请重新输入。\n");
            continue;
        }

        printf("请输入购买的数量: ");
        scanf("%d", &quantity);

        if (quantity < 0) {
            printf("购买数量不能为负数，请重新输入。\n");
            continue;
        }

        if(choice == 1 || choice == 2)
            total_price += 3 * quantity;
        else if(choice == 3)
            total_price += 5 * quantity;
        else
            total_price += 2 * quantity;

        printf("请投入金额: ");
        scanf("%f", &amount_paid);

        change = amount_paid - total_price;
        printf("本次购买总价: %.2f 元\n", total_price);
        printf("找零: %.2f 元\n", change);

        total_price = 0;
    }

    printf("感谢您的购买，欢迎下次光临！\n");
    return 0;
}

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问题
【1】每次购买饮料的总价会加上之前所有购买的饮料总价
【2】continue的语义是终止这次循环并继续

实验3

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#include <stdio.h>
 
int main(){
	char a;
	int j =4;
	for (int i=0;i < j; ++i ){
		scanf("%c",&a);
		getchar();
		if (a == 'r'){
		printf("stop!\n");
		}
		else if (a == 'y'){
		printf("wait a minute\n");
		}
		else if (a == 'g'){
		printf("go go go\n");
		}
		else{
		printf("some thing must be wrong..\n");}
		
		}
	
	return 0;
}

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实验4

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#include <stdio.h>
 
int main(){
	double num,sum = 0,max = 0,min = 20001;
	printf("输入今日开销，直到输入-1终止：\n");
	while(1){
		scanf("%lf",&num);
		if(num == -1){
			break;
		}
		sum += num;
		if(max < num){
			max = num;
		}
		if(min > num){
			min = num;
		}
		
	}
	printf("今日消费累计总额：%.1lf\n",sum);
	printf("今日最高一笔开销：%.1lf\n",max);
	printf("今日最低一笔开销：%.1lf\n",min);
	return 0;
}#include <stdio.h>
 
int main(){
	double num,sum = 0,max = 0,min = 20001;
	printf("输入今日开销，直到输入-1终止：\n");
	while(1){
		scanf("%lf",&num);
		if(num == -1){
			break;
		}
		sum += num;
		if(max < num){
			max = num;
		}
		if(min > num){
			min = num;
		}
		
	}
	printf("今日消费累计总额：%.1lf\n",sum);
	printf("今日最高一笔开销：%.1lf\n",max);
	printf("今日最低一笔开销：%.1lf\n",min);
	return 0;
}

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实验5

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#include <stdio.h>
 
int main(){
	int a,b,c,j=5;
	for (int i = 0; i < j; ++i){
		scanf("%d %d %d",&a,&b,&c);
		if(a==b && b==c){
			printf("等边三角形\n");
			continue;
		}
		if(a==b||b==c||a==c){
			printf("等腰三角形\n");
			continue;
		}
		if(a*a+b*b==c*c||a*a+c*c==b*b||b*b+c*c==a*a){
			printf("直角三角形\n");
			continue;
		}
		if(a+b>c&&a+c>b&&b+c>a){
			printf("普通三角形\n");
			continue;
		}
		else{
			printf("不能构成三角形\n");
			continue;
		}
		
	}
	return 0;
}

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实验6

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#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main(){
	srand((unsigned)time(NULL));
	int num = rand() % 30 + 1;
	int j = 3,a,i;
	printf("猜猜2026年11月那一天是你的lucky day\n开始喽，你有三次机会，猜吧（1~30）：");
	for(i = 0; i < j; ++i){
		scanf("%d",&a);
		if(a==num){
			printf("哇，猜中了:)");
			break;
		}
		if(a < num){
			printf("你猜的日期早了，你的lucky day还没到呢\n再猜（1~30）");
			continue;
		}
		if(a > num){
			printf("你猜的日期晚了，你的lucky day在前面哦\n再猜（1~30）");
			continue;
		}
	}
	if (i == 3){
		printf("次数用光啦，11月你的lucky day是%d号",num);
	}
	return 0;
}

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